Reproductive System IV Flashcards
Primary oocyte starts meiosis before
A woman is born
Meiosis pauses in what stage until puberty?
Prophase I
What happens to the oocytes during this gap of egg formation?
A bunch of eggs regress until puberty
The meiotic division of oocytes will result in
- 1 secondary oocyte
- 1 polar body
What happens to follicle cells after puberty?
The develop around the egg
Secondary oocyte starts
Meiosis, resulted in an ovulated egg
It is important to note that the ovulated egg has not finished
Meiosis
What happens when an egg is penetrated?
It is triggered to quickly finish second meiotic division
Meoisis I temporarily pauses until
Penetration
What is produced by the second meiotic division?
- 1 egg with chromosomes
- Polar body
The egg is big in size because it contains
Nutrients for developing pre-embryo as it moves down fallopian tube
How long does it take for egg to move from fallopian tube into uterus?
5 days
How many eggs do women produce per month?
1
The monthly cycle is driven by the interactions between
Hypothalamic hormones and ovaries
Changes in the ovaries occur in response to
FTH
The Uterine Cycle is influenced by
The Ovarian Cycle
What are the two cycles of the Monthly Cycle?
- Ovarian Cycle
- Uterine Cycle
Day 1 of the monthly cycle refers to
First day of period
Day 28 of the monthly cycle is the
Last day before period
Day 14 is the day of
Ovulation
What happens during ovulation?
Secondary Oocyte ruptures through the follicle, pops out of the ovary wall and enters the peritoneal cavity
The ruptured follicular cells left in ovary will develop into the
Corpus Luteum
The Corpus Luteum aims to
Prepare the endometrial lining to receive developing embryo
What are the phases of the Ovarian cycle?
- Follicular Phase
- Luteal Phase
What happens during the Follicular Phase?
Follicle surrounding oocyte is developing, dividing, and sending hormonal signals to the egg, stimulating resumption of meiosis
The Follicular Phase consists of events which
Lead up to ovulation
What happens during the Luteal Phase?
Corpus luteum secretes hormones like estrogen and progesterone
What is the function of estrogen and progesterone?
They direct the buildup of the lining of the endometrium
What happens if fertilization does not happen?
Corpus luteum breaks down and regresses
The Corpus Luteum breaks down due to
No secretion of hormones
The Ovarian Cycle is established at the beginning of
Puberty
The Ovarian Cycle is established in response to
GnRH
During childhood, the ovaries are inactive but still secrete minimal amounts of
Estrogen
Estrogen is a hormone which inhibits the release of
GnRH from the hypothalamus
As you get closer to puberty, body fat levels go up and leptin overrides
The effect of estrogen
Leptin is a hormone which causes for
GnRH to release
GnRH releases
FSH and LH by the anterior pituitary
FSH and LH target the
Ovaries
Uterine Cycle starts on the
First day of period
During the Uterine Cycle, what is shed every month?
Stratum functionalis
What are the phases of the Uterine Cycle?
- Menstrual Phase
- Proliferative Phase
- Secretory Phase
